On 27/07/2021 06:51, Bjorn via wsjt-devel wrote:
Hello

Maybe this is a known issue. But anyway: I have 10 VAC channels going here and I use 1 and 2 towards the WSJT-X software.

When I start the WSJT-X I get RX on ch1 and TX on Ch2. But after it has been running for sometime, say RXing for a day. And I then hit TX it uses Ch6 for some reason.

Restart WSJT-X fixes it.

I have used 2.4.0 and 2.5.3 RC3, same thing.

73 de SM7SJR

Hi Bjorn,

WSJT-X saves audio device names in its settings file but to access the devices we look them up and get an index number which we must use to interact with them. These index numbers are somewhat volatile and can change while WSJT-X is running if other audio devices on the system appear or disappear. It is too costly to look up the audio device index every time we need to start a transmission, e.g. on some platforms it takes several seconds to complete enumeration of the audio devices, so we are vulnerable to the devices that the index numbers reference changing without our knowledge.

We recommend that while using WSJT-X all system power options, that might disable a device carrying audio are disabled. This should include all USB hubs, and HDMI monitors.

73
Bill
G4WJS.



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